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qwelly [4]
3 years ago
9

What’s the domain and range of f(x)=72-12x

Mathematics
1 answer:
Mice21 [21]3 years ago
4 0

Answer:

<h2>hope it helps you see the attachment for further information ✌✌✌✌✌✌</h2>

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What the difference in temperature is
Alexandra [31]
The answer would be a positive 15.1 or +15.1 because the positive number is greater than the negative which would make your answer positive, thats why you got it wrong :) 
6 0
3 years ago
In 8 years, a girl will be 3 years older than twice her present age. How old is she now<br>​
Lisa [10]

Answer:

5

Step-by-step explanation:

You can express this as a system of equations:

x in this instance will be her present age.

x + 8 = 2x + 3

simply solve for x after this by subtracting three and x from both sides, and you’ll find that x is 5.

5 0
3 years ago
Which of the following is an extraneous solution of (45-3x)^1/2=x-9?
Iteru [2.4K]

Answer:

C. x =3

Step-by-step explanation:

Extraneous solution is that root of a transformed equation that doesn't satisfy the equation in it's original form because it was excluded from the domain of the original equation.

Let's solve the equation first

\sqrt{45-3x} = x-9\\Taking\ square\ on\ both\ sides\\{(\sqrt{45-3x})}^2 = {(x-9)}^2\\45-3x = x^2-18x+81\\0 = x^2-18x+81-45+3x\\x^2-15x+36 = 0\\x^2-12x-3x+36 = 0\\x(x-12)-3(x-12) = 0\\(x-3)(x-12)\\x-3 = 0\\=> x =3\\x-12 = 0\\x = 12\\We\ will\ check\ the\ solutions\ one\ by\ one\\So,\\for\ x=3\\\sqrt{45-3(3)} = 3-9\\\sqrt{45-9} = -6\\\sqrt{36}= -6\\6\neq -6\\For x=12\\\sqrt{45-3(12)} = 12-9\\\sqrt{45-36} = 6\\\sqrt{36}= 6\\6=6

Hence, we can conclude that x=3 is an extraneous solution of the equation ..

3 0
3 years ago
(-5 + 5i) + (4 – 4i)?
babunello [35]

Answer:

The answer is:

Step-by-step explanation:

1. -30

2. 20

3 0
2 years ago
Read 2 more answers
With a 5% sale discount, the price of an item is $38.00. What was the original price?
tresset_1 [31]

Answer:40

Step-by-step explanation:

1)38/x=95/100

2)cross multiply: 3800=95x

3)divide each side by 95 (3800/95 and 95x/95)

4)simplify to get the answer

7 0
2 years ago
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